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They are 4 feet wide. Structurally they were constructed as cantilever beams, and consist of concrete slabs of concrete 6 inches thick and reinforced with i-inch round bars spaced 6 inches center to center. These balconies are constructed at each concrete floor level. In Fig. 204 is shown a cantilever beam with a span of 6 feet. It is 12 inches wide and 26 inches in depth, and is reinforced with 4 bars - inch in diameter. This cantilever supports the exterior concrete wall and one end of a simple beam of a span of about 16 feet. The exterior and interior concrete columns were constructed of concrete, and reinforced with plain round bars. The roof construction was similar to the concrete floor construction. The concrete consisted of a mixture of 1 part Portland cement, 3 parts sand, and 5 parts stone. The stone was trap rock, broken to pass through a i-inch ring, dust screened out; and the sand is known as Jersey gravel, which is a bank sand.

The reinforcing bars were plain round bars of medium steel. The concrete columns used in the construction of the McNulty Building, New York City, are a very interesting feature in this building. The building is 50 feet by 96 feet, and is 10 stories high, and was one of the first small-concrete column reinforced-concrete buildings erected in New York. The plan of all the concrete floors is the same. A single row of interior concrete columns is placed in the center of the building, about 22 feet center to center. The concrete columns are of the hooped type, and were designed from the formula approved by the building laws of. New York City. The formula used was P = 1,600 r2 + (160,000 Ah P) X r + 6,000 A8, in which P = the total working load, r = radius of the helix, As = the total area of the vertical steel, Ah = sectional area of the hooping wire, P = the pitch of the helix. The interior concrete columns are cylindrical in form, except those supporting the roof, which are 12 by 12-inch and are reinforced with 4 bars 3 inch in diameter. In all the other stories except the ninth, they are 27 inches in diameter. Below the fifth concrete floor the reinforcement in each of .these concrete columns consists of 2-inch round vertical bars, - ranging in number from seven in the fifth concrete floor to thirty in the basement, and banded by a 24-inch helix of-inch wire with a pitch of 1 inches. The vertical bars were omitted between the sixth and tenth concrete floors; and the diameter of the helix was gradually decreased, while the pitch was increased.

In the ninth concrete floor the diameter was reduced to 21 inches. The concrete wall concrete columns are in general 30 by 26 inches, and support loads from 48,000 pounds in the tenth concrete floor to 719,750 pounds in the basement. In the sixth story, the reinforcement in these concrete columns consists of 3 round vertical bars 2 inches in diameter; and in each of the concrete floors below, the number of bars was increased in these concrete columns there being 24 in the basement: concrete columns. These are spirally wound with -h-inch steel wire forming a helix 23 inches in diameter, with a pitch of 2- inches. Above the seventh concrete floor, the concrete columns are reinforced with 4 bars 1 inch in diameter, and tied together by -h-inch wire spaced 18 inches apart. The concrete columns rest on cast-iron shoes, which are bedded on solid rock about 2- feet below the basement concrete floor. The main concrete floor girders extend transversely across the building, and have a clear span of 21 feet. The concrete floor-beams are spaced about 6 feet apart, and have a span of about 20 feet 6 inches. The two sides of the beams that slope downward and the width at the bottom being two inches less than the width at the under surface of the concrete slab. The reinforcement consists of plain round bars. The bars for the girders and beams were bent and made into a truss (the Unit System) at the shops of the contractor, and were shipped to the work ready to be put in place.

Are You in Marshfield Massachusetts? Do You Need Concrete Cutting?

We Are Your Local Concrete Cutter

Call 781-519-2456

We Service Marshfield MA and all surrounding Cities & Towns